Hi Michiel,
Maybe there is a "hack" you can use. First rename table bdf_setup to bdf_setup$:
rename bdf_setup to bdf_setup$;
Then create a view to manipulate the returned data the way you want it. A very very simple example follows:
create or replace view bdf_setup as
selecr var_cd,
bdf_setup_oid,
decode(var_cd,
'DefaultDatasourceDateFormat',
decode(put_your_critera_here,
'value_1', 'DD/MM/YYYY',
'value_2', 'MM/DD/YYYY',
......
value_tx --default formspider value
),
value_tx
) value_tx
from bdf_setup$